Is Dual SIM Wifi Calling Possible? Active/Passive Dual SIM? - Xiaomi Mi Mix 2S Questions & Answers

Apologies if I have missed anything in my search of the forum, I've got my finger on the button ready to buy a Mi Mix 2S but I need to know if I can use Wifi calling on both SIMs at the same time. It'll unfortunately be a deal-breaker if it doesn't, because I live and work in an area with poor signal and rely on it all day every day.
My carriers are H3G ("Three") UK, and EE UK, I've tried speaking to them both but that's just a waste of time and I can't get any answers there so hopefully the knowledgeable folk here may know.
Whilst the phone is within warranty I'd like to try and avoid flashing ROMs or anything else that may affect the warranty so I'd be running MIUI as it comes from new for the time-being.
Also I've been reading up a bit on active and passive standby, I understand that with passive, an ongoing call on one SIM would block the second from working, and passive allows both to receive calls at the same time. As I'll be using it for home and business purposes, if I'm on a personal call I wouldn't want to miss any work calls. So I gather I would need active dual SIM, I understand the CPU in the 2S supports this, but can anyone confirm if the feature is implemented/enabled?

I've ordered it now as it was on promotion and almost out of stock so didn't want to miss out. I'll report back once I've tested the above

I've received the phone today. Out of the box, it's not enabled for either sim. Typing *#*#4636#*#* shows the options, but they are greyed out for both sims sadly.
EE support most phones that have wifi calling capability, and Three officially support selected phones sold by them only, but they have an app to allow wifi calls on other phones.
I'll keep researching this to see if I can get it working

I've tried everything, there is no wifi calling on the mix2s. I've been able to get the toggles enabled and use qpst to activate the modem settings for the wifi calling feature but none of them enable the wifi radio to call out. It's somewhere in this q&a section already.
I tried on both MIUI and AOSP, neither work.
https://r.tapatalk.com/shareLink?ur...share_tid=3793039&share_fid=3793&share_type=t
Sent from my Mi MIX 2S using Tapatalk

try this
https://forum.xda-developers.com/poco-f1/how-to/guide-activate-vowifi-wlan-call-t3871263
it worked for me

fitzy75 said:
Apologies if I have missed anything in my search of the forum, I've got my finger on the button ready to buy a Mi Mix 2S but I need to know if I can use Wifi calling on both SIMs at the same time. It'll unfortunately be a deal-breaker if it doesn't, because I live and work in an area with poor signal and rely on it all day every day.
My carriers are H3G ("Three") UK, and EE UK, I've tried speaking to them both but that's just a waste of time and I can't get any answers there so hopefully the knowledgeable folk here may know.
Whilst the phone is within warranty I'd like to try and avoid flashing ROMs or anything else that may affect the warranty so I'd be running MIUI as it comes from new for the time-being.
Also I've been reading up a bit on active and passive standby, I understand that with passive, an ongoing call on one SIM would block the second from working, and passive allows both to receive calls at the same time. As I'll be using it for home and business purposes, if I'm on a personal call I wouldn't want to miss any work calls. So I gather I would need active dual SIM, I understand the CPU in the 2S supports this, but can anyone confirm if the feature is implemented/enabled?
Click to expand...
Click to collapse
I can confirm WiFi calling works for primary SIM as long as carrier support it and "carrier check" setting is disabled. If anyone knows about dual WiFi calling please tell us.

Related

[Q] Can I use a data-only SIM in my phone?

Hello,
I have a Samsung Galaxy S without a data-connection, I really need a data-connection becouse I think the phone really needs a data-connection.
So here's my question:
Is it possible to get a subscription of a data-only SIM (the subscriptions they use for tablets etc.)
It is possible to use that kind of SIM/subscription in a phone?
Since I don't really make calls or send text's I really need that but I still want to be able to call and send text's.
Does anyone got a answer?
I think it would be helpful if you told us where you're from. I'm pretty sure the conditions for data-only plans differ from country to country.
I'm from The Netherlands.
Data only sim should work fine. Curious to know, why you need data only sim on a phone. It kills the purpose of having a phone.
I tried some time ago in HTC Desire and it didn't work, still don't know why. (it works with PC + USB Huawei modem on both Windows and Linux, i have E1752 model)
And as an answer for qustion "why do you need it?" for example in Poland there is company which for the government licence for some frequences is obligated to offer free internet for 3 years. Don't think its lika a fairytale - internet disconnects after one hour and the speed is limited, but still can be very usefull when you are tight on budget or just need to check something quickly.
PS. maybe i should add that in this case voice service is disabled on the sim card level (tele service (ts11)) what seems to be a reason for some devices not to work.
edit: finally it appears to work. Dosen't display signal strength but websites (slowly) load.

Issues on T-Mobile

Recently purchased the Xperia Z5 (E6653) and I am having some serious issues with calls on T-Mobile USA.
Calls don't dial out (or it takes multiple tries) and calls won't come in when the phone is connected to 4g (LTE); they go straight to Voicemail. I missed about 12 phone calls yesterday - just getting voicemail after vaoicemail till I realized something was wrong on my side. If I toggle off the LTE it drops to Edge (no HSPA+) and calls come in fast and outgoing calls are made with no problem.
I tried to reset the phone, then repair the software with the Sony Companion app. Still same issue. Looked online for the APN settings. Tried various ones. Re-downloaded the Internet/MMS via the phone itself. Same issue. Tried my wife's sim and it was still doing the same. I have a spare 5s and it worked fine both incoming and outgoing calls. So, it doesn't seem like its the sim card.
I have Rev 2 of this phone so I am not sure if that is anything to be concerned about. Am I missing something...any help on this would be appreciated.
Thanks.
Maybe flash a T-mobile firmware with flashtool?
Or Flash 209 firmware meant for usa?
Or wait for someone here that use this phone on T-mobile.
Are you on band 12 LTE by chance
No, it said band 2 with LTE Discovery. I am on the verge of sending it back. Swap it for another one. Let's see.
From what I have gathered/read - it should really be straight forward. Pop in sim, load Internet settings, and it should work on T-Mobile. The APN settings are correct.
Doesn't makes sense for it to completely not work on 4g and go to 2G (Edge) while skipping 3g. I'm wondering if the baseband might just be wonky. I just see this as causing more problems down the road which I don't want from a $520 device.
Any advice is welcome because I am ordering the same phone again. Lemons are always possible.
Could it be possible because I live a relatively rural area (East TN) and the phone does not support AWS? Since it doesn't support T-Mobile VoLTE and doesn't have AWS it is defaulting to 2G? Is this an issue in all areas or just rural? Apparently the E6683 variant doesn't have this problem as it supports AWS.
Check this http://www.xperiablog.net/2015/10/07/usa-buyers-guide-sony-xperia-z5/
That means ur phone should work fine with T-mobile,maybe go and get a replacement from where you bought it.

Poco X3 in the US?

Have there been any US users brave enough to import this phone? What have been your experiences on Tmobile or AT&T?
andysensible said:
Have there been any US users brave enough to import this phone? What have been your experiences on Tmobile or AT&T?
Click to expand...
Click to collapse
Mine should be here on Thursday. I'll post some info once I get it
Thanks where did you buy it?
I got mine today from Amazon from a seller called Mobiles International (only one selling it right now). I'm on Mint mobile set up the APN and rebooted. Getting signal on par with my Mi Mix 2s no issues. I'll be posting more thorough post probably Sunday with my thoughts.
andysensible said:
Have there been any US users brave enough to import this phone? What have been your experiences on Tmobile or AT&T?
Click to expand...
Click to collapse
Yeah got mine in 3 weeks off Alibaba $239 not sure if they're still running the special I'm on Verizon northern Ohio but my 4g keeps cutting out I'm sure it's some setting I'm not doing right having trouble finding help
---------- Post added at 03:37 AM ---------- Previous post was at 03:35 AM ----------
rivethead23 said:
I got mine today from Amazon from a seller called Mobiles International (only one selling it right now). I'm on Mint mobile set up the APN and rebooted. Getting signal on par with my Mi Mix 2s no issues. I'll be posting more thorough post probably Sunday with my thoughts.
Click to expand...
Click to collapse
Any idea how to change our find apn for Verizon?
This phone is GSM only. That might be part of the issue with Verizon. To set the APN you go to settings>Sim cards and mobile network>click on the Sim card>Access Point Names.
Glock45 said:
Yeah got mine in 3 weeks off Alibaba $239 not sure if they're still running the special I'm on Verizon northern Ohio but my 4g keeps cutting out I'm sure it's some setting I'm not doing right having trouble finding help
---------- Post added at 03:37 AM ---------- Previous post was at 03:35 AM ----------
Any idea how to change our find apn for Verizon?
Click to expand...
Click to collapse
maybe this one
https://www.4gapn.com/us/en/verizon
but if this site is right using poco x3 in verizon is not the best idea
https://www.kimovil.com/en/frequency-checker/US/xiaomi-poco-x3
Anyone able to get volte with it?
anon1135 said:
Anyone able to get volte with it?
Click to expand...
Click to collapse
Yes I'm in northern Ohio southern mi and the signal is great but there is some setting I'm not getting right it'll connect to LTE for half minute then switch off it shows 3 of 5 Verizon bands ?
Glock45 said:
Yes I'm in northern Ohio southern mi and the signal is great but there is some setting I'm not getting right it'll connect to LTE for half minute then switch off it shows 3 of 5 Verizon bands
Click to expand...
Click to collapse
Yes...
anon1135 said:
Anyone able to get volte with it?
Click to expand...
Click to collapse
Yes to enable VOLTE dial the following into the phone dialer:
*#*#86583#*#*
rivethead23 said:
Yes to enable VOLTE dial the following into the phone dialer:
*#*#86583#*#*
Click to expand...
Click to collapse
Are you on t mobile? Some of my other xiaomi's phones have it enabled but it still drops to 3g during calls. But another different xiaomi with the same sim will also have it working so I've been confused whether it's carrier or device dependant
I'm on Mint Sim. I did make a few calls and discovered a few things. If you enter the above code it then shows the VoLTE option under the sim card. If I toggle it on, phone calls don't go through. Toggle off they do. I observed when making a phone call that the mobile signal says 4g rather than LTE during the call. If I use *#*#4636#*#* to go to the info screen it says the voice network type is LTE. Lower on the screen it says that VoLTE provisioned is off. If I toggle mobile radio power off then on the LTE provisioned will then go to On. If I try to make a call the connection resets (network drops for like a minute) and the LTE provisioned toggle goes back to off once the network comes back up.
WiFi Calling Not Working
rivethead23 said:
I'm on Mint Sim. I did make a few calls and discovered a few things. If you enter the above code it then shows the VoLTE option under the sim card. If I toggle it on, phone calls don't go through. Toggle off they do. I observed when making a phone call that the mobile signal says 4g rather than LTE during the call. If I use *#*#4636#*#* to go to the info screen it says the voice network type is LTE. Lower on the screen it says that VoLTE provisioned is off. If I toggle mobile radio power off then on the LTE provisioned will then go to On. If I try to make a call the connection resets (network drops for like a minute) and the LTE provisioned toggle goes back to off once the network comes back up.
Click to expand...
Click to collapse
I'm on Mint Mobile too. I've been trying to find any info I can to enable WiFi Calling, as Band 2/4/5 coverage in my area is weak, and the only strong signal we have at our home is Band 12 which this phone doesn't support, unfortunately.
A few observations:
I disabled both the VoLTE carrier check (*#*#86583#*#*) and the VoWiFi carrier check (*#*#869434#*#*) and enabled both toggles within the SIM card settings page with no luck.
I also saw the settings you mentioned on the hidden info/settings screen ( *#*#4636#*#*) and, similarly to what you said, any options I modify simply revert back. IMS Status is also indicated as "Not Registered" in the more tab at the bottom, and I'm not sure if this is directly related to these features not working. I can't seem to register my SIM Card with the Xiaomi SIM Activation Service either (it requires an international text or something). When I attempt to do so, I just receive a "Can't activate SIM card; Server error occurred while requesting an activation SMS." message. I linked my number with my MI Account on the website, but I still am getting that error, so I'm not sure what's going on there.
Lastly, if I change my phone's WiFi Calling option to WiFi Only (via another secret menu that I accessed with an app literally called "WiFi Calling" lol) it can't make any outgoing calls at all. It can only function with a mobile connection available. If anyone has any info to share on the possibility of enabling WiFi Calling on this phone in the US, or has had experience with configuring other stingy Xiaomi phones, that would be greatly appreciated.
I know in the mint app there's a toggle to turn on wifi calling which is off by default. Did you turn that on?
rivethead23 said:
I know in the mint app there's a toggle to turn on wifi calling which is off by default. Did you turn that on?
Click to expand...
Click to collapse
Oh, yes. I have. At this point I may just have to purchase a cell signal booster for our home, but VoWiFi would definitely be the best case scenario.
Changing regions
Anyone know if you could do factory reset and select a different region that would put you on different bands for Verizon allowing me to get service here in the US? Just checking if anyone's tried that ?
SeekerofLight.iz said:
I'm on Mint Mobile too. I've been trying to find any info I can to enable WiFi Calling, as Band 2/4/5 coverage in my area is weak, and the only strong signal we have at our home is Band 12 which this phone doesn't support, unfortunately.
A few observations:
I disabled both the VoLTE carrier check (*#*#86583#*#*) and the VoWiFi carrier check (*#*#869434#*#*) and enabled both toggles within the SIM card settings page with no luck.
I also saw the settings you mentioned on the hidden info/settings screen ( *#*#4636#*#*) and, similarly to what you said, any options I modify simply revert back. IMS Status is also indicated as "Not Registered" in the more tab at the bottom, and I'm not sure if this is directly related to these features not working. I can't seem to register my SIM Card with the Xiaomi SIM Activation Service either (it requires an international text or something). When I attempt to do so, I just receive a "Can't activate SIM card; Server error occurred while requesting an activation SMS." message. I linked my number with my MI Account on the website, but I still am getting that error, so I'm not sure what's going on there.
Lastly, if I change my phone's WiFi Calling option to WiFi Only (via another secret menu that I accessed with an app literally called "WiFi Calling" lol) it can't make any outgoing calls at all. It can only function with a mobile connection available. If anyone has any info to share on the possibility of enabling WiFi Calling on this phone in the US, or has had experience with configuring other stingy Xiaomi phones, that would be greatly appreciated.
Click to expand...
Click to collapse
I'm on t mobile and have a few different budget phones from xiaomi and none of them stay on lte during calls for some reason even though I have the volte toggle enabled after dialing the code. Only one of my xiaomi phones which is a more expensive kind will have volte working by default with the same sim card. Not sure what the differences are between them but the budget phones are volte capable for other users just with a different service. Weird because if it's carrier related and my same sim isn't working then something else isn't right. Volte will be an important requirement in the US starting in 2021 because of the 3g shutdown right?
There is a pc tool to modify the modem and also a different one for band unlocking but not too sure how reliable they are. People did have success with it though check out this thread here
https://forum.xda-developers.com/redmi-note-7/help/volte-wifi-calling-redmi-note-7-t3931119/page3
It's a different xiaomi phone but I think the method could be similar. On the last page, someone on t mobile said they were able to get volte and rcs working after some changes. Not sure about wifi calling though. I might try this myself soon though I'm not too advanced with it. It should be fine if an old budget phone is used for testing. Seems to be one of the most useful info I've found after some digging around
Glock45 said:
Anyone know if you could do factory reset and select a different region that would put you on different bands for Verizon allowing me to get service here in the US? Just checking if anyone's tried that ?
Click to expand...
Click to collapse
The only Verizon bands this phone supports are the 4G bands 2, 4, and 5. No 2G or 3G. It's tailored more so for GSM carriers and Verizon is a CDMA carrier. I don't see how factory resetting or changing the region would affect the bands as that has more to do with the internal modem and antennae than it does the software. But I could very well be mistaken. Awhile back I know there was a weird method to "unlock all bands" if your phone had a Qualcomm chip in it, so phone tech and their carriers can admittedly be a bit of an enigma to me lol. Regardless, I'd advise against getting this phone if you're on Verizon.
anon1135 said:
I'm on t mobile and have a few different budget phones from xiaomi and none of them stay on lte during calls for some reason even though I have the volte toggle enabled after dialing the code. Only one of my xiaomi phones which is a more expensive kind will have volte working by default with the same sim card. Not sure what the differences are between them but the budget phones are volte capable for other users just with a different service. Weird because if it's carrier related and my same sim isn't working then something else isn't right. Volte will be an important requirement in the US starting in 2021 because of the 3g shutdown right?
There is a pc tool to modify the modem and also a different one for band unlocking but not too sure how reliable they are. People did have success with it though check out this thread here
https://forum.xda-developers.com/redmi-note-7/help/volte-wifi-calling-redmi-note-7-t3931119/page3
It's a different xiaomi phone but I think the method could be similar. On the last page, someone on t mobile said they were able to get volte and rcs working after some changes. Not sure about wifi calling though. I might try this myself soon though I'm not too advanced with it. It should be fine if an old budget phone is used for testing. Seems to be one of the most useful info I've found after some digging around
Click to expand...
Click to collapse
Thanks a ton for this info! My dad has a Redmi Note 7 so I might try this out for both of us and see what kind of results I can get.
I stumbled across this icon today, to my surprise. I had followed the steps to modify the modem in the phone, but could not really find an adequate profile among the options to enable for T-Mobile/Mint in the US. I mostly work from home where my cell signal isn't the greatest, so I didn't even see it until a couple days after the modifications.
I'm not entirely sure if it's the modifications to the modem that caused the icon to appear, or simply enabling it via the dialer code but I was surprised to see it, nonetheless.
I tried making a few calls with it, but it seems to disappear when I get into an actual phone call, and unfortunately I have no news on the VoWiFi front.

AT&T will not support my unlocked device

Pardon my noobness, I will explain this to the best of my abilities
AT&T told me that my current phone Samsung S8+ will not work on their network (international dual sim unlocked version). They said that it is because "the 3G will shut off" but this phone is clearly a 4G phone. To be more specific, my device is a SM-G955FD. They sent me a replacement phone which is less than crappy and said my current sim will be deactivated soon.
I have already rooted (and ROM'ed) my phone - and I know you can change device identity/fingerprint using build props. I want to mask my phone as a SM-G955FU which is the USA unlocked version. At this point, I'd like to know if this could make a difference and make my phone not be deactivated by fooling their system, or if there are other things to try.
List of permitted phones
https://www.att.com/idpassets/images/support/wireless/Service-Capabilities-Unlocked-Devices-ATT-Network.pdf
Help appreciated,
I don't think they query device's brand / model property as stored in Android's build.prop file because these characteristics at any time can get changed by user.
The speed of data access relies on two things: your phone and your service provider. Every phone has a radio module that is responsible for talking to the network. It is this piece of hardware that either can or can not use latest communication technologies: if the phone does not support 4G, you will not get that speed whatever you try.
jwoegerbauer said:
I don't think they query device's brand / model property as stored in Android's build.prop file because these characteristics at any time can get changed by user.
The speed of data access relies on two things: your phone and your service provider. Every phone has a radio module that is responsible for talking to the network. It is this piece of hardware that either can or can not use latest communication technologies: if the phone does not support 4G, you will not get that speed whatever you try.
Click to expand...
Click to collapse
Thanks, what is odd is that it should support it on several bands
Will Samsung Galaxy S8+ work in USA?
In this page we are going to show you the compatibility of Samsung Galaxy S8+ with the mobile networks of USA and with the telephony operators that provide service in USA.
www.kimovil.com
The same thing happened to me today, woke up to a sim not registered message and no cell service (voice, sms or data).
I went to the store and they said my unlocked Moto G7 Power (XT1955-2) is not supported/compatible on ATT's network. I re-checked the phone's specs and it supports 4G LTE on bands 12 and 17 on 1900 Mhz which overlaps the data I found for ATT's network. I'm not well versed in this stuff tho. Perhaps it's a local towers thing and I am in an area where their towers are operating on the other ATT frequencies (1700, 700)? The guy at the store did something (I forget the exact details) and I do have voice back, but that is it, no data or SMS. He also mentioned that ATT is like cracking down on what kind of devices can connect. If ATT is blocking my device tho I'm curious, how is it possible? I guess they can lookup my device via the IMEI and then see if it's on their approve list of devices?
I don't understand their problem. Your phone model is listed as supported as long as you update your software to enable WiFi calling (VoLTE). Come 2/2022, you phone must either be 5G or VoLTE calling enabled to be supported. My Xiaomi Mi Mix 2s shows that it can do VoLTE under the sim card details in Settings and supports 13 LTE bands, including AT&T's bands. It should continue to work on their network after 2/2022.
Yet AT&T repeatedly disabled my phone. I had to tell them to re-activate my phone multiple times. I have tried some new phones. Turned out everytime I pulled the sim out to try a new phone and stick it back in my old phone, AT&T would check the phone's IMEI again and would disable the phone. On the 5th call with them, they put in a code/note in their system to mark my IMEI (be ware each sim tray has its own IMEI) not to be disabled until Fed 2022. I have since tried Surface Duo which on this list and decided not to keep it. Stuck the sim card back in my old phone specific sim tray and it continues to work.
Call them to re-activate/keep your phone active until Fed 2022. They have no rights to disable your phone before then.
Most A&T reps understand less than us on the reason to disable our phone. They jsut keep saying 3G phones will be disabled but our phoens are clearly LTE. VoLTE is one real reason of the problem but them our phones support VoLTE anyway. I am tired of arguing with them and am looking at a Note 10 now. But your situation got me concerned. Sounds like they may not honor the supported list which is updated frequently. I downloaded the June version of the list which is largely the same as yours and asked them how long they would support the phones on the list. They couldn't/wouldn't commit. Even on the phones they sell at their website, they would only give a vague promise to support them for "quite a while".
AT&T has always advertized BYOP. We spent big money on nice phones that are compatible with their network. And now the want to shut us out.

WIFI Calling

Hello, there is a common USA Issue. pretty much every phone which is not sold through the provider lite ATT / Tmobile etc all the Phone features like VolLTE and WIFI Calling are not possible and locked.
A sim Card in one of their phones works. Using any of the XIAMOI i.e. or phones all the features work with any provider other than the US ones. Is this something where they
ReinSauter said:
Hello, there is a common USA Issue. pretty much every phone which is not sold through the provider lite ATT / Tmobile etc all the Phone features like VolLTE and WIFI Calling are not possible and locked.
A sim Card in one of their phones works. Using any of the XIAMOI i.e. or phones all the features work with any provider other than the US ones. Is this something where they
Click to expand...
Click to collapse
Because the US devices are carrier/SIM locked unless the device is unlocked using the device's/carrier's specific unlock method. As far as I know, Volte and Wi-Fi calling are setup and regulated by the carrier from their end, not on the user end.
Well I think we missunderstood a little SOme us Devices especially ATT are "SIM" Locked this is a total different avenue .
I am talking about WIFI Calling. Szenario :
I have a us SIm Card WIFI Calling VoLTE in US Phones Iphone and the few Androids (99% Samsung) they sell working fine
I use a European Phone works fine with almsot any provider (WIFI Calling and VoLTE) in most phones from euopr and the US phones as described above.
Use Teh US Sim Card in one of the EUropean phnes every thing works in terms of Data and VOice,Text but "NO" WIFI Calling od VoLTE . WIFI Calling is not even showing up.
My question is as simple as it can be "WHERE" and what technology swith the features on and OFF ? It must be recognized by the IMIE Number or IM Wrong ?

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